Jeanne, my dad is 80, has had PD several years, the rigidity is the primary symtom. Unfortunately, the doctors and most folks have the attitude that when you are 80, why bother looking for trouble, etc. Well I have another viewpoint. If you make it to 80, you could live many more years, so why not get the best help, even if it is not easy, or convenient? Even a few years of better quality of life, or at least not getting worse, is worth the trouble. A difference in meds, exercize, vitamins, etc etc can bring large improvements for your dad. Even if it does not make a large improvement, you will feel better for making the effort. I am NOT to make you feel guilty, It is obvious you are trying to do the best you can. Also, any improvement he can get will benefit you are your mom. Keep us informed on what you do, and how it helps. Ken B